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Thread: Modifying a Wohlhaupter UPA4.
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12th Aug 2017, 08:41 PM #16.
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- Nov 2008
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- Perth WA
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It looks the part Techo.
How will you hold the 40 arbor while machining the Wohl mount?
Bob.
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13th Aug 2017, 10:46 AM #17Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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Bob, after the internal 16mm drawbar thread is cut I will pull the shank back against it's 65mm diameter flat face on a faceplate. Holding the shanks for grinding after hardening will be another story.
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13th Aug 2017, 11:53 AM #18.
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24th Aug 2017, 10:20 PM #19Golden Member
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- Riddells Creek, Vic.
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A little more progress on the shanks, this is the setup I used to bore, drill and screw cut to ensure that the threaded hole stays concentric and straight.
IMG_1417.JPG
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11th Sep 2017, 07:41 PM #20Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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The 2 shanks are ready for Carburizing, hopefully later this week.
Shanks 1.jpg
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19th Sep 2017, 05:19 PM #21Golden Member
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- Riddells Creek, Vic.
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Pack Carburizing at 910 degrees C today.
IMG_1486.JPG
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20th Sep 2017, 10:35 PM #22Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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They are now ready for Hardening and Tempering. I filled the threaded holes with Refractory Cement (Fire Clay) to prevent extra carbon being absorbed by the threads which could make them very brittle.
Carburized.jpg
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21st Sep 2017, 10:34 AM #23Pink 10EE owner
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- Aug 2008
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- near Rockhampton
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You did quench them after pulling them from the furnace?
Gold, the colour of choice for the discerning person.
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21st Sep 2017, 07:32 PM #24Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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22nd Sep 2017, 07:37 PM #25Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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- 831
Grinding the #4MT shank.
MT4 to Wohlhaupter.jpg
Various stages of completion.
Wohlhaupter Shanks - semi finished..jpg
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22nd Sep 2017, 08:26 PM #26.
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- Nov 2008
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- Perth WA
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Very nice Techo!
How are you supporting the tailstock end of the arbors, a dummy centre screwed into the drawbar thread or the tailstock's centre running off a chamfer at the entrance to the bore? I like the hose clamp "dog". One to remember.
Bob.
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22nd Sep 2017, 10:02 PM #27Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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Yes Bob,it's running between dead centres on the 60 degree chamfers machined in each end.
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3rd Oct 2017, 10:32 PM #28Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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Every Home machinist should have one of these.
Attachment 370405
xrf gun.jpg
I was having second thoughts about the scrap yard material I used for the two Wohlhaupter shanks/arbors considering I have had it for over 20 years and the colour coding on the end of the bar is almost completely worn off.
A bit late I know, but I decided to have it tested to confirm that it was actually EN36A, the scan results are below.
XRF Scan.jpg
It came up as 9310, the AISI equivalent of EN36A so all is well. It appears that the XRF does not have European standards in its data base.
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4th Oct 2017, 12:25 AM #29Most Valued Member
- Join Date
- May 2011
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- Murray Bridge S Aust.
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- 71
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- 5,943
Unfortunately your attachment 370405 comes up with "Invalid Attachment specified. If you followed a valid link, please notify the administrator"
Nice piece of workmanship on your shank/arbor. Thanks for the WIP report.
That's an amazing interesting piece of equipment, as you say Every Home machinist should have one of these.
I'll bet it wasn't cheap, or is it a work perk??
KrynTo grow old is mandatory, growing up is optional.
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4th Oct 2017, 11:25 AM #30
A quick check shows prices from $8k to $22k for secondhand on US EBay. Would be handy to know of someone with such a machine. Steel merchant or similar. Could I just check this trailer load of scrap mystery metal?
Dean
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